xgettext: Scheme: #!fold-case and #!no-fold-case directives.
Reported by Florent Angly <florent.angly@gmail.com>
at <https://savannah.gnu.org/bugs/?61987>.
* autogen.sh (GNULIB_MODULES_TOOLS_FOR_SRC): Add unicase/u8-casefold,
uninorm/nfc.
* gettext-tools/src/x-scheme.c: Include unicase.h, uninorm.h.
(SIZEOF): New macro.
(phase0_getc): Renamed from do_getc. Remove line_number handling.
(phase0_ungetc): Renamed from do_ungetc. Remove line_number handling.
(MAX_PHASE1_PUSHBACK): New macro.
(phase1_pushback, phase1_pushback_length): New variables.
(phase1_getc, phase1_ungetc): New functions.
(casefold): New variable.
(read_token): Use phase1_getc, phase1_ungetc instead of do_getc, do_ungetc.
(read_object): Likewise. If casefold is true, apply Unicode case-folding to
symbols before looking them up in the hash table. Recognize all #! directives
supported by Guile.
(extract_whole_file): Initialize phase1_pushback_length, casefold.
* gettext-tools/tests/xgettext-scheme-6: New file.
* gettext-tools/tests/Makefile.am (TESTS): Add it.
